The project files are available via svn only for now.
To get the source use:svn co http://libgarmin.svn.sourceforge.net/svnroot/libgarmin/libgarmin/dev libgarmin
build with:
./autosh.sh
./configure
make
make install
How to build Navit driver:Driver is merged into navit CVS so you do not have to patch it,
just install the library and rebuild navit.
Then you can add maps to navit.xml